Improvement in spark-arresters



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Letters Patent No. 111,507, dated February 7, 1871.

-IMPROVEMENT IN SPARK-ARRE-STERS.

The Schedule referred to ln these Letters Patent and making part of thesame.

To au 10h-am t 'may concern'.-

Be it known that I, THOMAS A. ANDREWS, Jr., of Philadelphia,Pennsylvania, havel invented a new and useful Improved Spark-Arresterfor the smokestacks of locomotive-engines.

The following is a specification of my invention In the drawing- AFigure 1 is a longitudinal vertical section of a smoke-stack and itsexterior casing, and of my sparkarresting devices.

Figure 2, a perspective of the series ot dish-shaped or lianged platesc, d, and e, detached.

Figure 3, a plan of the casing, (the top g being removed,) designed toshow the shield or open cover m..

In fig. 1-

a represents a smoke-stack, and b the casing of the saine, both ofordinary construction.

0, d, and e, figs. 1 and 2, represent dish-shaped or fiauged plates,united together by several cross-braces j, so as to leave clear spacesbetween the plates for draft, as shown.

The plates are open in the middle. They have flaring or tapered sides,and they are set in the top of the casing b, as shown in fig. 1, andsecured by bolts passed through anges of the casing b, dish c, andremovable top g, as at h, tig. 1.

e', iig. 1, is a casting, both faces of which are con- Vex, the top facebeing almost flat.

It is supported by rods, two of which, j and k, are shownin fig. 1.

The cast-ing i is designed to correspond in horizontal area with thebottom of the lowermost dish c, and is arranged directly below thisdish, leaving a little space between the two.

m, Iig. 3, is au open cover, a little larger in its middle part, in',than the `middle openings Ain dish c and top g.

.Ihe cover m is secured between the top g andthe casing b by the bolts71, above mentioned.

lhe operation of the parts described is such that the sparks or cinderscoming up through the smokestack a strike the lower face ofthe castingi, and are reected, and striking the dishes 0,11, and e, and theirflanges c', d', and c' are arrested and caused to drop down between thecasing b and the smoke-stack.

'lhey are removed as often as desired through the covered opening n,fig. l; I prefer to ernploy the open cover m, tig. l, but it may bedispensed with without material disadvantage.

The flanges c', d', and' c' of the dishes c, d, and e are a little' morein breadth than the distances between t-he dishes.

The' casting t presents the segment oi' a sphere to the ascendingcurrent of sparks, and this forinis preferable to the conical formvhitherto sometimes employed.

I claimrlhe combination of the casting i, the series of dish-shaped orflanged plates c, d, and c, and the open cover nl., with the casing b,smoke-stack a, and remov-y able top g, in the manner and for the.purpose substantially as set forth.

THOMAS A. ANDREWS, Jn.

Witnesses J. WARREN CAILSTON, GEORGE E. BUGKLEY.

